JPH0267577A - Electrophotographic printing device - Google Patents

Abstract

PURPOSE:To easily mount and remove a developing device by integrally forming the developing device and a paper feeding roller and making the service life of the developing device equal to that of the paper feeding roller. CONSTITUTION:At the time of replenishing tone from the upper surface of a developing device, a cut sheet feeder 9 is slid in the direction shown by the arrow 11 and at the time of processing a paper jam and exchanging a drum magazine 4, the developing device 3, and fixing device 7, an opening/closing case 6 is turned in the direction shown by the arrow 14. The drum magazine 4 can be removed in the direction shown by the arrow 12 after the case 6 is opened and the fixing device 7 can be removed in the direction shown by the arrow 15. The developing device 3 can be removed in the direction in which the device 3 does not collide with the magazine 4 and cut sheet feeder 9, namely, in the direction shown by the arrow 13. When the developing device 3 is integrally formed with a paper feeding roller 2 in such way, the developing device and roller can be removed together in the direction shown by the arrow 13 when their service lives terminate. Therefore, the developing device can be easily removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic printing device such as a printer or a copier using an electronic process.

[Conventional technology]

FIG. 2 shows a sectional view of a printer using a conventional electrophotographic printer.

Paper to be printed is fed from a cut sheet feeder 9 to a paper feed roller 2. The paper is controlled to a constant feeding speed by the paper feeding roller 2 and heads toward the drum and transfer position 20a. After the transfer, the image is fixed by a fixing device 7. The paper is ejected from the paper ejection roller 10.

The general unit configuration of such a conventional printer includes a cut sheet feeder 9, a developing device 3, a paper feed roller 2, a writing head 5, a drum magazine 4, a fixing device 7, a paper ejection roller 10, an opening/closing case 6, and more. The cut sheet feeder 9 can be installed and removed in the direction of arrow 11, the drum magazine 4 in the direction of arrow 12, the fuser 7 in the direction of arrow 15, the opening/closing case 6 in the direction of arrow 15, and the developing device 3 in the direction of arrow 15. It is carried out in 13 directions.

[Problem to be solved by the invention]

However, the above-mentioned prior art has a problem in that the developing device 3 cannot be attached or detached unless the paper feed roller 2 is removed.

SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its object is to provide a configuration in which the developing device can be removed without removing the paper feed roller.

[Means to solve the problem]

The electrophotographic printer device of the present invention is characterized in that the lifespan of the developing device and the lifespan of the paper feed roller are made to be the same.

〔Example〕

FIG. 1 shows a sectional view of an electrophotographic printer device of the present invention. The unit configuration of this printer device includes a cut sheet feeder 9, a developing device 30, a paper feed roller 2, a writing head 5, a drum magazine 4, a fixing device 7, a paper ejection roller 10, an opening/closing case 6 + a paper feed driven roller 1. has been done.

The lifespan of this printer device is set at 300,000 sheets. However, 1) agglomeration of the developer, wear of the sleeve, wear of the developing bias rotation contact 2) wear of Teflon in the fuser, wear of the bearing 3) deterioration of the photosensitive drum of the drum magazine, deterioration of the erase lamp, dirt on the charging wire , Wear of the rotating contact for contacting the photosensitive drum 4) Decrease in the friction coefficient of the paper feed roller 5) Decrease in the friction coefficient of the paper feed roller of the cut sheet feeder, decrease in the friction coefficient of the separation pad 6) Polygon motor of the laser writing unit, semiconductor Lifespan of the laser 7) Lifespan of the main motor, gear train, and fan motor 8) Contamination of the transfer wire of the opening/closing case The lifespan of each unit is determined by the above reasons. In this printer device, the developer capacity is 100,000 sheets,
The fuser has a capacity of 100,000 sheets, the drum magazine has a capacity of 20,000 sheets, the paper feed roller has a capacity of 100,000 sheets, the cut sheet feeder has a capacity of 100,000 sheets, and only the writing head unit and main body (frame, gear train, motor) have a capacity of 300,000 sheets. It has a lifespan of 1,000,000 sheets.

Since this is a product that contains built-in parts with different lifespans, it is necessary to make the drum magazine unit 4, fuser unit 7, developer unit 3, and cut sheet feeder unit 9 into units for easy replacement. .

In addition, the following parts need to be replaced: 1) Toner 2) Waste toner 3) Cleaning pad (fuser) 4) Transfer set, so the configuration must be such that they can be easily replaced.

It is also necessary to expose the paper conveyance path in consideration of paper jam disposal. The parts that sandwich paper include: 1) Paper feed roller of the cut sheet feeder 2) Paper feed roller 3) Photosensitive drum and transfer device 4) Fixing roller 5) Paper ejection roller. is required.

The printer shown in FIG. 1 is constructed based on this idea.

In order to supply toner from the upper surface of the developing device, the cut sheet feeder 9 slides in the direction of the arrow FIJ11 in the figure.

The opening/closing case 6 rotates in the direction of the arrow 14 in the figure in order to process the paper jam and replace the drum magazine 4, developing device 3, and fixing device 7.

To attach and detach the drum magazine, after opening the opening/closing case 6, the drum magazine is taken out in the direction of the arrow 12 shown in the figure. The fixing device 7 is indicated by the arrow 15 in the figure.
It is removed in the direction of.

The developing device should be attached and detached in a direction that does not hit the drum magazine and cut sheet feeder, and in the present invention, the direction shown by arrow 13 is
Attach/detach in the direction of.

In conventional printer devices, the problem is that it is difficult to remove the paper because it avoids the paper feed roller and pulls out in a direction closer to the cut sheet feeder or closer to the drum magazine, or removes the developer unit after removing the paper feed roller. had points.

In the printer device of the present invention, the developing device 3 and the paper feed roller 2 are integrated, so when 100,000 sheets have been produced and both the developing device and the paper feeding roller have reached the end of their service life, they can be easily removed in the direction of the arrow 13. can.

〔Effect of the invention〕

As described above, according to the present invention, the developing device and the paper feeding roller are made integrally so that the life of the developing device and the life of the paper feeding roller are the same, thereby avoiding the paper feeding roller.
The developer unit can be easily removed without having to perform difficult operations such as removing the developer unit in a narrow space near the cut sheet feeder or drum magazine, or removing the developer unit after removing the paper feed roller. Also,
At the end of their service life, the paper feed roller and developer unit, which were previously replaced separately, can be replaced at the same time, eliminating wasteful replacement operations.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the printer device of the present invention. FIG. 2 is a general sectional view of a conventional printer device. 2...Paper feed roller 3...Developer unit Below Up

Claims (1)

[Claims] An electrophotographic printing device that performs printing using an electrophotographic process, characterized in that a paper feed roller and a developing device are integrated, so that the life of the developing device and the life of the paper feeding roller are made the same.